include vs intercalate

include

verb
  • To consider as part of something; to comprehend. 

  • To use a directive that allows the use of source code from another file. 

  • To bring into a group, class, set, or total as a (new) part or member. 

noun
  • A piece of source code or other content that is dynamically retrieved for inclusion in another item. 

intercalate

verb
  • To insert anything somewhere (especially between other things), such as an affix into a word. (Compare interpolate.) 

  • To insert an extra month into a calendar for the same purpose. The Hebrew calendar has such a month. 

  • To insert a substance between two or more molecules, bases, cells, or tissues. 

  • To insert an extra leap day into a calendar in order to maintain synchrony with natural phenomena. 

How often have the words include and intercalate occurred in a corpus of books? (source: Google Ngram Viewer )